Time delay relay system



June 27, 1944. J wH 2,352,353

TIME DELAY RELAY SYSTEM Filed Dec. 25, 1940 INV NTOR 6/ W I 78 7s t 4 WATTORNE QZ Patented June 27, 1944 TIME DELAY RELAY SYSTEM Joe White,Anderson, Ind., assignor to General Motors Corporation, Detroit, Mlcln,a corporation of Delaware Application December 23, 1940, Serial No.371,285

4 Claims.

cause the high volume horn to sound also. This object is accomplished bya system including two single coil relays for withholding the connectionof the high volume horn with the battery for a predetermined periodafter the horn switch is closed.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawing wherein a preferred embodiment of the present invention isclearly shown.

In, the drawing:

Fig. 1 is a wiring diagram illustrating the embodiment of the presentinvention.

Figs. 2, 3, and 4 are fragments of the diagram shown in Fig. 1 and showsthe relay of the system in different stages of operation.

According to Fig. 1 the warning signal for city driving is provided by apair of low volume horns and 2| having different frequencies and sorelated that a harmonious chord is produced. For country driving or foruse in an emergency the system includes a high volume horn 22. Horns 20and 2| are connected with ground and with awire 24 connected withstationary contact 26 of a horn relay 25. Contact 26 is normallyseparated from contact 21 carried by armature 28, attracted by anelectromagnet including core 29 and a coil 36. Armature 28 and coil 30are connected with battery 3| grounded at 32. The circuit of the coil 30is controlled by a control switch or horn button 33 comprisingstationary contacts 34 and 35 and a movable contact 36 normally heldaway from the stationary contact by spring 31.

carrying a-core 42 surrounded by coil 43. Frame 4| supports a resilientarmature hinge-blade 44 attached to an armature 45 which is biasednormally away from the core 42. Armature 45 carries a spring blade-46carrying a contact 41 normally out of engagement with a contact 43.Armature 45 insulatingly supports a blade 43 carrying a contact 50normally engaging a contact 5|. Core 42 has a chromium plated pole face42a against which the armature 45 seals when attracted to it. Core 42 issurrounded by a copper tube 42b which retards flux decay. Thereforethere is a delay in the retraction of armature 45 following the opencircuiting oi magnet coil 43.

The relay comprises a frame 6| supporting a core 62 surrounded by coil63. Frame 6| supports an armature hinge-blade 64 attached to armature 65supporting a blade 66 carrying a contact 61 normally engaging a contact36. Blade 66 carries also a contact 63 for making engagement with acontact 10.

The relays 46 and 60 may be mounted upon the same base to provide adouble relay unit. This unit will have three terminals 1|, l2 and I3.Terminal 1| is connected by wire I4 with contact 5| .of relay 40 and bywire 15 with high volume horn 22'. Terminal I2 is connected by wire 16with wire 24 and by wire 11 with frame 4| of relay 40 and by wire 13with frame 6| of relay 60. Terminal 13 which is grounded at 19 isconnected by wire with one end of the coil 43 of relay 40 having itsother end connected by wire 8| with contact 68 of relay 60. Terminal I3is connected by wire 82 with coil 63 of relay 60 also connected by wire83 with contact 16 of relay 60 and contact 48 of relay 40. Wire 84connects wire 83 with contact 50 of relay 40. The normal status of thesystem is shown in Fig. 1. When the horn switch 33 is closed, relay 25is closed to connect battery 3| with low volume horns 23 and 2|. Ifswitch 33 is closed for a period exceeding the time usually required togive the city warning signal, then the relays 40 and 66 will operate inthe manner disclosed in Figs. 2, 3, and 4 in order to connect the highvolume horn 22 with the battery.

The first stage shown in Fig. 2. Following the closing of relay 25, thecoil 43 of relay 43 will be connected with -the battery through thecircuit indicated in heavy lines in Fig. 2. This will cause armature 45to be attracted toward core 42 so that contacts 41 and 43 will beclosed. Following this coil 63 of relay to will be energized asindicated by the heavy dash lines in Fig. 2.

Then armature I! of relay 60 will be attracted toward core 82 as shownin Fig. 3 thereby causing contact 61 to be separated from contact 88 andcontact I! to engage contact Ill. This causes coil 41 of relay 40 to bedisconnected from the battery while coil 83 of relay 60 is connectedwith the battery independently or contacts 41 and 4! of relay 40 asindicated in heavy lines in Fla. 3.

Then armature 45 of relay Ill moves upwardly to cause the contact 50 toreengage contact II and separate contact 41 from contact 48. Thisestablishes a circuit between wire 2! connected with relay 25 andbattery 3|, and wire leading to the horn 22 as shown by the heavy linesin Fig. 4. Therefore, horn 22 is connected with battery 3| and-is causedto sound a loud warning signal.

Because a substantial period of time elapses during the operations ofthe relays through the various stages indicated in Figs. 2, 3, and 4,the sounding of the horn 22 has been withheld for a predetermined timeafter the closing of the control switch 33. In this way the sounding ofthe low volume signal for city driving and the high volume for countrydriving is controlled through a single switch or-horn button. The highvolume signal is caused to sound only when the driver presses the hornbutton for a period longer than is usually required to give the ordinarycity signal.

While the embodiment of the present invention as herein disclosed,constitutes a preferred Iorm, it is to be understood that other formsmight be adopted, all coming within the scope of the claims whichfollow.

What is claimed is as follows:

1. A circuit control system comprising a current consuming device; acurrent source; manually controlled switch for establishing a connectionin the circuit between the source and the device; and means set intoaction by the establishment of said connection for completing thecircuit between the source and the device a predetermined time aftercommencement of the establishment of the said first connection, saidlast mentioned means including a first relay hav ing a core surroundedby a tube for retarding flux decay, a second relay having a core, eachof said cores being surrounded by a single coil adapted to be connectedin a different circuit, said first relay controlling a normally closedswitch in the circuit of the device and a normally open switch havingconnections with the coil of the second relay, and the second relaycontrolling anormally closed switch having connections with the coil ofthe first relay and a normally open switch having connections with thecoil of the second relay and both switches controlled by the firstrelay, the first coil being energized upon closure of the manuallycontrolled means to open the first mentioned normally closed switch andclose the first mentioned normally open switch whereby the second coilis in circuit with the source, the energizetion oi-the second coilopening the-second normally closed switch and closing the secondnormally open switch for completing another circult for the second coilwith the source, the closing of the second mentioned normally openedswitch opening the circuit to the first coil, said first coil, after itsflux decay, permitting the first mentioned normally open switch to closeand complete the circuit to the device through a circuit including theclosed normally open switch of the secondary relay and the closedmanually controlled switch.

2. A circuit control system comprising 9. current consuming device; acurrent source; manually controlled switch for establishing a connectionin the circuit between the source and the device; and means set intoaction by the establishment of said connection for completing thecircuit between the source and the device a predetermined time aftercommencement of the establishment of the said first connection, saidlast mentioned means including a first relay having a magnet coil andhaving means associated therewith for retarding fiux decay, said magnetcontrolling a normally closed switch and a normally open switch; asecond relay having an armature attracting coil and an armature, saidarmature carrying a movable contact disposed between two stationarycontacts with the movable contact normally engaging one of thestationary contacts having connections with the coil of the first relayand the other stationary contact not normally engaged having connectionswith the coil of the second relay and both of said first mentionedswitches, said first relay when energized operating to open the firstnonmally closed switch and close the first normally open switch toconnect the second mentioned magnet coil in a circuit with the source,the energization of the second coil attracting the armature of thesecond relay to move the movable contact into engagement with the otherstationary contact to maintain the energization of said coil but openthe circuit to the first mentioned coil, said first relay returning,after its delayed fiux decay, to its normal position where by the firstmentioned normally closed switch will complete the circuit to the devicethrough a circuit including the closed normally open switch of thesecond relay and the closed manually controlled switch.

3. A circuit control system comprising a current consuming device; acurrent source; manually controlled switch for establishing a connectionin the circuit between the source and the device; and means set intoaction by the establishment of said connection for completing thecircuit between the source and the device a predetermined time aftercommencement of the establishment of the said first connection, saidlast mentioned means comprising a first relay and a second relay, saidfirst relay having a single magnet coil and having means associatedtherewith for retarding flux decay and said second relay having a singlemagnet coil, both of said relays having an armature for controlling anormally closed and a normally open switch, said first relay whenenergized operating to open its normally closed switch and close thenormally open switch to connect the coil of the second relay in acircuit, said second coil when energized operating to open its normallyclosed switch and close its normally open switch to retain the secondcoil in circuit, the opening of the normally closed switchopen-circuiting the coil of the first relay, said first relay, after itsflux decay, returning to its normal position to complete a circuit tothe device which includes the closed manually controlled switch, theclosed normally open switch of the second relay, and the normally closedswitch oi the first relay, said device remaining connected with thecurrent source so long as the manually controlled switch is closed.

4. A circuit control system comprising a current consuming device; acurrent source; manually controlled switch for establishing a counctionin the circuit between the source and the device; and means set intoaction by the establishment of said connection for completing thecircuit between the source and the device a predetermined time aftercommencement of the establishment of the said first connection, saidmeans comprising two relays each having a core and a single magnet coilsurrounding its core, one of the relays being relatively fast-operatingand the other being a time-lag relay having fluxdecay-retarding means,each relay having a normally open switch and a normally closed switch,said switches being respectively closed and opened when the relay isenergized, and circuits in series with the manually controlled switch,one of the circuits comprising the two normally open relay switchesconnected in parallel and a second parallel circuit connected in serieswith the first parallel circuit and comprising the coil of thefast-operating relay in parallel with a circuit comprising the normallyclosed switch or the time-lag relay and the current consuming device,and another circuit parallelling said series of parallel circuits andcomprising the normally closed switch of the fast-operating relay andthe magnet coil of the time-lag relay, whereby, upon closure of themanually controlled switch, the time-lag relay operates to close itsnormally open switch to connect the coil of the fast-operating relaywith the source while opening its normally closed switch to prevent theconnection of current consuming device with the current source, and thefast-operating relay operates to close its normally open switch toprovide for connection of its coil with the current source independentlyof the .then closed switch or" the time-lag relay, and thefast-operating relay operates to open its normally closed switch todisconnect the coil of the time-lag relay from the current source, andthe time-lag relay finally operates to restore its switches to normalstatus whereby the current consuming device is connected with the sourcethrough the manually controlled switch, the closed normally open switchof fastoperating relay and the normally closed switch of the time-lagrelay.

JOE WHITE.

